GBE: fix a bug in int64 to float conversion.
GBE: fix a bug in int64 to float conversion.

When copy those pure 32bit int to float destination, we
should enable the mask. Otherwise, we may destroy the
value in inactive lanes.

Signed-off-by: Zhigang Gong <e04a7b9b70b1e4c6318cf117dcd1a9056e14b97a@intel.com>
Reviewed-by: Yang Rong <78759e37dc7114caed18f74e7515c5cb519dbf6d@intel.com>

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